29 because 1+1=2 2+2=4 4+3=7 7+4=11 11+5=16 16+6=22 22+7=29
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The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.
16
This looks like a (subtract 5; add 2) series, so the next numbers are: 2, 4, -1, 1
1. Each number is 1/2 of previous number.
The series 1 6 10 13 15 (1+5=6; 6+4=10, 10+3=13; 13+2=15) is completed by 15+1=16. The answer is 16.